package cn.hnedu.util;

import java.security.MessageDigest;

public class MD5 {
    private String inStr;
     private MessageDigest md5;

     /**
      * Constructs the MD5 object and sets the string whose MD5 is to be computed.
      *
      * @param inStr the <code>String</code> whose MD5 is to be computed
      */
     public MD5(String inStr)
     {
     this.inStr = inStr;
         try
     {
        this.md5 = MessageDigest.getInstance("MD5");
         }
     catch (Exception e)
     {
        System.out.println(e.toString());
        e.printStackTrace();
         }
     }

     /**
      * Computes the MD5 fingerprint of a string.
      *
      * @return the MD5 digest of the input <code>String</code>
      */
     public String compute()
     {
  // convert input String to a char[]
  // convert that char[] to byte[]
  // get the md5 digest as byte[]
  // bit-wise AND that byte[] with 0xff
  // prepend "0" to the output StringBuffer to make sure that we don't end up with
  // something like "e21ff" instead of "e201ff"

     char[] charArray = this.inStr.toCharArray();

     byte[] byteArray = new byte[charArray.length];

     for (int i=0; i<charArray.length; i++)
        byteArray[i] = (byte) charArray[i];

     byte[] md5Bytes = this.md5.digest(byteArray);

         StringBuffer hexValue = new StringBuffer();

     for (int i=0; i<md5Bytes.length; i++)
     {
        int val = ((int) md5Bytes[i] ) & 0xff;
        if (val < 16) hexValue.append("0");
        hexValue.append(Integer.toHexString(val));
     }

     return hexValue.toString();
      }
      public static void main(String[] args)
      {
          MD5 md5 = new MD5(
                  "admin@force1168528608{839D8B94-E5E5-477d-B21A-E7BD2F8BDC4A}");
          String postString = md5.compute();
          System.out.println(postString.toUpperCase());
      }
}
